In the simplified Drake equation, a value of flife = 1 would imply that
A) there is one other habitable planet in the galaxy
B) all habitable planets in the galaxy have life
C) there is one other habitable planet in the galaxy with life on it now
D) all habitable planets in the galaxy have life on them now
B
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A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.)
A) Its acceleration is constantly decreasing. B) Its acceleration is constant. C) Its acceleration is constantly increasing. D) Its acceleration is zero. E) Its acceleration is greater than g.
A high-voltage power line 20 m above the ground carries a current of 5000 A. What is the magnetic field due to the current directly underneath the power line? (µ0 = 4p × 10^-7 T×m/A)
a. 14 mT c. 20 µT b. 35 µT d. 50 µT
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object is never at rest.
a.
True
b.
False
Brief increases in atmospheric sulfur in Venus's atmosphere may be due to
A. chemical reactions between sulfuric acid clouds and the surface. B. cloud-to-cloud lightning in Venus's atmosphere. C. a large meteor entering Venus's atmosphere. D. a volcanic eruption on Venus's surface.